fix: resolve remaining tsc errors for CI build

- Fix globalThis.DurableObject access in test-setup.ts (no index signature)
- Fix Uint8Array<ArrayBufferLike> assignment in streaming reader

Author: teamchong

src/index.ts

@@ -178,7 +178,7 @@ class RemoteExecutor implements QueryExecutor {
           while (true) {
             const { done, value } = await reader.read();
             if (done) break;
-            pending = pending.length > 0 ? concat(pending, value) : value;
+            pending = pending.length > 0 ? concat(pending, new Uint8Array(value)) : new Uint8Array(value);
 
             // Process complete frames
             while (pending.length >= 4) {

src/test-setup.ts

@@ -3,7 +3,7 @@
  * DurableObject is a base class provided by the Workers runtime —
  * tests run in Node and need a minimal stand-in.
  */
-if (typeof globalThis.DurableObject === "undefined") {
+if (typeof (globalThis as Record<string, unknown>).DurableObject === "undefined") {
   (globalThis as Record<string, unknown>).DurableObject = class DurableObject {
     protected ctx: unknown;
     protected env: unknown;